Despite its name, this window is on the geographic East wall opposite the altar and below the round “rose” window. It is also referred to as the Drummond Memorial window. The window is composed of three lancet panels contained within a single, Gothic-shaped space. It is inscribed with “I Believe in the Communication of Saints, the Resurrection of the Body and the life Everlasting,” as well as other references to The Trinity. Subtle leaf vine patterns suggest the energizing, renewing power of nature. Other images contained in the Drummond window include a crown encircling a cross which represents heavenly reward after suffering earthly trials; an anchor which was an early symbol for Jesus; two sets of interlocking circles representing the Trinity and shamrocks-the plant's three leaves also symbolizing The Trinity.
Thomas and Delia Drummond were founders of Trinity. Thomas served as a federal judge with jurisdiction over admiralty and patent law and he heard cases with regard to slavery issues. He presided over a dozen cases tried by Abraham Lincoln and became a friend of the future President’s. In 1869, President Grant nominated Drummond to a seat on the newly established Court of Appeals. Judge Drummond retired to Wheaton in 1884 and died in 1890. His home is the blue house across Wesley Street from the chapel.